From 989134e71bd01eaa9baf1e8e4654da3258fef014 Mon Sep 17 00:00:00 2001
From: Tatsuyuki Ishi <ishitatsuyuki@gmail.com>
Date: Wed, 28 Feb 2018 21:56:37 +0900
Subject: [PATCH 1/2] Add regression test for #48551

---
 src/test/run-pass/issue-48551.rs | 40 ++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 src/test/run-pass/issue-48551.rs

diff --git a/src/test/run-pass/issue-48551.rs b/src/test/run-pass/issue-48551.rs
new file mode 100644
index 00000000000..61146cd087b
--- /dev/null
+++ b/src/test/run-pass/issue-48551.rs
@@ -0,0 +1,40 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::ops::{Mul, MulAssign};
+
+pub trait ClosedMul<Right>: Sized + Mul<Right, Output = Self> + MulAssign<Right> {}
+impl<T, Right> ClosedMul<Right> for T
+where
+    T: Mul<Right, Output = T> + MulAssign<Right>,
+{
+}
+
+pub trait InnerSpace: ClosedMul<<Self as InnerSpace>::Real> {
+    type Real;
+}
+
+pub trait FiniteDimVectorSpace: ClosedMul<<Self as FiniteDimVectorSpace>::Field> {
+    type Field;
+}
+
+pub trait FiniteDimInnerSpace
+    : InnerSpace + FiniteDimVectorSpace<Field = <Self as InnerSpace>::Real> {
+}
+
+pub trait EuclideanSpace: ClosedMul<<Self as EuclideanSpace>::Real> {
+    type Coordinates: FiniteDimInnerSpace<Real = Self::Real>
+        + Mul<Self::Real, Output = Self::Coordinates>
+        + MulAssign<Self::Real>;
+
+    type Real;
+}
+
+fn main() {}

From 11eb83ae749f037997ad6bf0841daa69d625f066 Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Wed, 28 Feb 2018 13:04:12 -0500
Subject: [PATCH 2/2] Update issue-48551.rs

---
 src/test/run-pass/issue-48551.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/test/run-pass/issue-48551.rs b/src/test/run-pass/issue-48551.rs
index 61146cd087b..93bddbc5335 100644
--- a/src/test/run-pass/issue-48551.rs
+++ b/src/test/run-pass/issue-48551.rs
@@ -8,6 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// Regression test for #48551. Covers a case where duplicate candidates
+// arose during associated type projection.
+
 use std::ops::{Mul, MulAssign};
 
 pub trait ClosedMul<Right>: Sized + Mul<Right, Output = Self> + MulAssign<Right> {}